Question 465383
c. 5 cans of paint.

{{{S = pi*r*sqrt(r^2 + h^2)}}} gives the lateral surface area of the cone.

r = 8, h = 15 ==> {{{S = 136pi}}} square ft, the lateral surface area.

Since both inside and outside are to be painted, we need paint that will cover an area of {{{272pi}}} sq.ft.  Dividing this by 200, we get 4.272 approximately.

Hence 5 cans of paint are needed.